Title: Investigating the current - potential difference relationship for a metal wire. Aim: To design an experiment that will facilitate an I - V Graph to be ascertained of a metal wire and thus find the resistance of the wire by deriving the inverse of the gradient of the graph. Skill: Planning & Designing Theory: Resistance is a property of any object or substance to resist or oppose the flow of an electrical current. The quantity of resistance in an electric circuit determines the amount of current flowing in the circuit for any given voltage applied to the circuit. This is according to Ohm's law. The unit of resistance is the Ohm which has the Greek letter 'Omega (Ω)'. By default, that is, for electrical calculations, the inverse of Resistance is obtained and this is known as conductance. If conductance is calculated by dividing current by potential difference then from the preceding phrase it can be deduced that, Resistance is calculated by ascertaining the inverse of conductance. The reasons for this will be provided within the Discussion/ Conclusion section. The resistance of an object is determined by the nature of the substance of which it is composed and this is known as the resistivity which are the dimensions of the object and the temperature. Resistance, however, is expressed in terms of the Ohm resistance per cubic centimeter at 20 oC (293 K). In its simplicity, before resistance is calculated, conductance is first obtained. Therefore: Current Conductance = Potential Difference Pooran (Rocky) Appadu Theory: Current -1 Resistance = Potential Difference Hypothesis: With reference to Ohm's law, by varying the potential difference (using the rheostat), the current will increase linearly for the metal wire thus allowing an I - V graph to be ascertained. By deriving the gradient of the graph, the conductance of the wire will be obtained and finding the inverse of conductance, the resistance of the wire will be ascertained. Apparatus: 1. Voltmeter 2....

...the wire affects a current flowing through a wire. I know that as resistance changes, current changes, as Ohm's law:
I = V/R. If one part of an equation changes, the equal must be done to the opposite side. To detect how resistance affects current, I must first discover what factors affect resistance. These factors are:
· Length of the wire if a wire is longer; there are more particles for...

...An experiment to investigate the factors which affect Resistance in a wire
What is resistance?
A potentialdifference (V) applied across a wire of length (l), there is in the conductor, an electric field (E). In this electric field the free electrons are not however under continuous acceleration (Ee/m). This is because they repeatedly collide with the moderately massive vibrating atoms losing their kinetic energy. The...

...resistance of a wire is affected by the length of the wire.
Theory
What is resistance?
Resistance is a force which opposes the flow of an electric current around a circuit so that energy is required to push the charged particles around the circuit. The circuit itself can resist the flow of particles if the wires are either very thin or very long.
e.g. The filament across an electric light bulb.
How is it measured?
The...

...Planning:
Risk Assessment:
* I will handle the power supply carefully.
* I am going to only use a maximum voltage of 2 volts.
* I will be careful when handling the mains equipment.
* I will make sure I have a clear space to work in and nothing on the floor around me.
In this investigation, I will set up a simple circuit to be able to read the voltage and current when the length of wire changes, so I then can work out the resistance. I will be...

...Investigating the resistance of a wire.
Planning
For this investigation there are a number of variables that can be chosen to change or keep the same, these are:
· Length of the wire.
· Diameter of the wire.
· Type of the wire.
· Temperature of the wire.
Scientific explanation.
All electrical conductors resist current through them to some extent. This is resistance...

...objective in this experiment is to investigate one of the factors that affect the resistance of a piece of wire; the one I am investing is the length at constant temperature.
My objective in this experiment is to investigate one of the factors that affect the resistance of a piece of wire. The factor I chose was length.
Factors:
There our four different things that affect the resistance of a wire:
1. The Length ...

...Introduction
The resistance of a wire depends on certain factors. Some of these variables are listed below:
Length of wire
Diameter or thickness of wire
Temperature at which wire is kept
The material of which wire is made out of.
The potentialdifference or voltage.
Humidity
Cross sectional area.
Voltage across circuit
All these factors will have to be kept...

...eInvestigating water potential of swede
The aim of our experiment was to investigate the water potential of swede and then use our results to help us determine the water potential of plant tissue.
This overall flow of water from a dilute area of high water potential to a more concentrated solution of low water potential across a partially permeable membrane is called osmosis. I predicted that the swede...

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